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<msg time='2009-09-14T17:11:45.823-04:00' org_id='oracle' comp_id='rdbms' msg_id='opistr_real:935:3971575317' type='NOTIFICATION' group='startup' level='16' host_id='dellpe' host_addr='192.168.1.252' pid='31552' version='1'> <txt>Starting ORACLE instance (normal) </txt> </msg> <msg time='2009-09-14T17:11:46.507-04:00' org_id='oracle' comp_id='rdbms' msg_id='ksunfy:14932:2937430291' type='NOTIFICATION' group='startup' level='16' host_id='dellpe' host_addr='192.168.1.252' If you have utilities or tools to generate reports from XML (such as an Oracle database using XDB XML DB for example), you may query/report on that format as well. Of course, Enterprise Manager also displays the important alert log information as well.
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Data files, along with redo log files, are the most important type of files in the database. This is where all of your data will ultimately be stored. Every database has at least one data file associated with it, and typically has many more than one. Only the most simple test databases have one file. In fact, in 2 we saw that the simplest CREATE DATABASE command by default created a database with three data files: one for the SYSTEM tablespace (the true Oracle data dictionary), one for the USER tablespace, and one for the SYSAUX tablespace (where other nondictionary objects are stored in version 10g and above). Any real database will have at least these three data files. After a brief review of file system types, we ll discuss how Oracle organizes these files and how data is organized within them. To understand this, you need to know what tablespaces, segments, extents, and blocks are. These are the units of allocation that Oracle uses to hold objects in the database, and I describe them in detail shortly.
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A Brief Review of File System Mechanisms
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There are four file system mechanisms in which to store your data in Oracle. By your data, I mean your data dictionary, redo, undo, tables, indexes, LOBs, and so on the data you personally care about at the end of the day. Briefly, they are Cooked operating system (OS) file systems: These are files that appear in the file system just like your word processing documents do. You can see them in Windows Explorer; you can see them in UNIX as the result of an ls command. You can use simple OS utilities such as xcopy on Windows or cp on UNIX to move them around. Cooked OS files are historically the most popular method for storing data in Oracle, but I see that changing with the introduction of ASM (more on that in a moment). Cooked file systems are typically buffered as well, meaning that the OS will cache information for you as you read and, in some cases, write to disk. Raw partitions: These are not files these are raw disks. You don t ls them; you don t review their contents in Windows Explorer. They are just big sections of disk without any sort of file system on them. The entire raw partition appears to Oracle as a single large file. This is in contrast to a cooked file system, where you might have many dozens or even hundreds of database data files. Currently, only a small percentage of Oracle installations use raw partitions due to their perceived administrative overhead. Raw partitions are not buffered devices all I/O
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performed on them is direct I/O, without any OS buffering of data (which, for a database, is generally a positive attribute). Automatic Storage Management (ASM): This is a new feature of Oracle 10g Release 1 (for both Standard and Enterprise editions). In releases prior to 11g Release 2, ASM is a file system designed exclusively for use by the database. An easy way to think about it is as a database file system. You won t store your shopping list in a text file on this particular file system you ll store only database-related information here: tables, indexes, backups, control files, parameter files, redo logs, archives, and more. But even in ASM, the equivalent of a data file exists; conceptually, data is still stored in files, but the file system is ASM. ASM is designed to work in either a single machine or clustered environment. Since Oracle 11g Release 2, ASM provides not only this database file system but optionally a clustered file system as well, which is described next. Clustered file system: This is specifically for a RAC (clustered) environment and provides what looks like a cooked file system that is shared by many nodes (computers) in a clustered environment. A traditional cooked file system is usable by only one computer in a clustered environment. So, while it is true that you could NFS mount or Samba share (a method of sharing disks in a Windows/UNIX environment similar to NFS) a cooked file system among many nodes in a cluster, it represents a single point of failure. If the node owning the file system and performing the sharing failed, that file system would be unavailable. In releases of Oracle prior to 11g Release 2, the Oracle Cluster File System (OCFS) is Oracle s offering in this area and is currently available for Windows and Linux only. Other third-party vendors provide certified clustered file systems that work with Oracle as well. Oracle Database 11g Release 2 provides another option in the form of ACFS, the ASM Clustered File System. A clustered file system brings the comfort of a cooked file system to a clustered environment.
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Note As of Oracle Database 11g Release 1 (11.1.0.7), there is yet another file system available Exadata.
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Exadata is a storage area network for Oracle specifically designed for the database. It is beyond the scope of this book to describe that piece of hardware however, so we will not be discussing it in any detail.
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The interesting thing is that a database might consist of files from any or all of the preceding file systems you don t need to pick just one. You could have a database whereby portions of the data were stored in conventional cooked file systems, some on raw partitions, others in ASM, and yet other components in a clustered file system. This makes it rather easy to move from technology to technology, or to just get your feet wet in a new file system type without moving the entire database into it. Now, since a full discussion of file systems and all of their detailed attributes is beyond the scope of this book, we ll dive back into the Oracle file types. Regardless of whether the file is stored on cooked file systems, in raw partitions, within ASM, or on a clustered file system, the following concepts always apply.
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